I'm also getting trouble starting my tekkit. only, mine ran before. what I (stupidly) done ,was when a SP world started loading and took a while, I tried to close minecraft. When that didn't work, I closed it with task manager and tried to start it again.
when I pressed play, it started verifying and just stops. Then I repeat and the same happened...
HELP PLEASE I want to have a lan next week but won't work with this problem...